I've tested this in latest SVN builds of 1.6 and 1.7. I'm using this feature in 1.6 so a backport would be much appreciated if/when this is fixed.
Basically, the B2BUA fails to properly handle To users containing params. The B2BUA pulls the params from the R-URI on the initial call leg and inserts them into the To header on the second call leg.
So, the initial INVITE from the B2BUA contains a To header that looks like:
On the responses, the to-tag has been added by the UAS:
The issues then occur on the ACK from the B2BUA (to 200 OK to initial INVITE):
The params & host have been stripped. This causes calls to fail to properly connect & tear down prematurely.
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